120-4x=90

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Solution for 120-4x=90 equation: 


Simplifying
120 + -4x = 90

Solving
120 + -4x = 90

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-120' to each side of the equation.
120 + -120 + -4x = 90 + -120

Combine like terms: 120 + -120 = 0
0 + -4x = 90 + -120
-4x = 90 + -120

Combine like terms: 90 + -120 = -30
-4x = -30

Divide each side by '-4'.
x = 7.5

Simplifying
x = 7.5

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